org.fastnate.generator.context

Class TableIdGenerator

java.lang.Object

org.fastnate.generator.context.IdGenerator

org.fastnate.generator.context.TableIdGenerator

public class TableIdGenerator
extends IdGenerator

Saves the current value for a TableGenerator. The content of the value column is interpreted like nextValue of a sequence, which means the maximum allocated value is allways at most value column value - allocationSize.

Author:

Tobias Liefke

Constructor Summary

Constructors

Constructor and Description
TableIdGenerator(javax.persistence.TableGenerator generator, GeneratorContext context) Creates a new instance of SequenceIdGenerator.

Method Summary

Modifier and Type	Method and Description
void	addNextValue(TableStatement statement, GeneratorColumn column, Number value) Adds the generated value to the given statement.
void	alignNextValue(StatementsWriter writer) Creates all statements that are necessary to set the next value created from the database is currentValue + 1.
long	createNextValue() Resolves the next value of this generator.
void	createPreInsertStatements(StatementsWriter writer) Creates the statements that are needed in the output before IdGenerator.addNextValue(TableStatement, GeneratorColumn, Number).
IdGenerator	derive(GeneratorTable currentTable) Some implementations (like the Hibernate table generator) create a different generator, depending on the table name.
int	getAllocationSize()
long	getCurrentValue() The last value returned by IdGenerator.createNextValue(Class).
GeneratorDialect	getDialect()
ColumnExpression	getExpression(GeneratorTable table, GeneratorColumn column, Number targetId, boolean whereExpression) Builds the reference to another entity that has the given ID.
GeneratorTable	getGeneratorTable()
long	getInitialValue()
long	getMaxAllocatedValue() The maximum allocated value.
long	getNextValue()
GeneratorColumn	getPkColumn()
ColumnExpression	getPkColumnValue()
GeneratorColumn	getValueColumn()
boolean	isPostIncrement() Indicates that IdGenerator.createNextValue(Class) should be called after the entity was written - as the value is not available before.
boolean	isRelativeIds()
void	setCurrentValue(long currentValue) Sets a new start value.

Methods inherited from class org.fastnate.generator.context.IdGenerator

createNextValue

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

TableIdGenerator

public TableIdGenerator(javax.persistence.TableGenerator generator,
                        GeneratorContext context)

Creates a new instance of SequenceIdGenerator.

Parameters:

generator - the annotation that contains our settings

context - the current context

Method Detail

addNextValue

public void addNextValue(TableStatement statement,
                         GeneratorColumn column,
                         Number value)

Description copied from class: IdGenerator

Adds the generated value to the given statement. Depending on the generator this may add the value itself or a reference to the value.

Specified by:

addNextValue in class IdGenerator

Parameters:

statement - the current insert statement

column - the ID column of the current table

value - the current value of the column, previously generated with IdGenerator.createNextValue()

alignNextValue

public void alignNextValue(StatementsWriter writer)
                    throws IOException

Description copied from class: IdGenerator

Creates all statements that are necessary to set the next value created from the database is currentValue + 1.

Specified by:

alignNextValue in class IdGenerator

Parameters:

writer - the target of the created statements

Throws:

IOException - if the writer throws one

createNextValue

public long createNextValue()

Description copied from class: IdGenerator

Resolves the next value of this generator.

Specified by:

createNextValue in class IdGenerator

Returns:

the generated value

createPreInsertStatements

public void createPreInsertStatements(StatementsWriter writer)
                               throws IOException

Description copied from class: IdGenerator

Creates the statements that are needed in the output before IdGenerator.addNextValue(TableStatement, GeneratorColumn, Number).

Overrides:

createPreInsertStatements in class IdGenerator

Parameters:

writer - target for the created statements

Throws:

IOException - if the writer throws one

derive

public IdGenerator derive(GeneratorTable currentTable)

Description copied from class: IdGenerator

Some implementations (like the Hibernate table generator) create a different generator, depending on the table name.

Overrides:

derive in class IdGenerator

Parameters:

currentTable - the current entity table

Returns:

the generator

getCurrentValue

public long getCurrentValue()

Description copied from class: IdGenerator

The last value returned by IdGenerator.createNextValue(Class).

Specified by:

getCurrentValue in class IdGenerator

Returns:

the current value

getExpression

public ColumnExpression getExpression(GeneratorTable table,
                                      GeneratorColumn column,
                                      Number targetId,
                                      boolean whereExpression)

Description copied from class: IdGenerator

Builds the reference to another entity that has the given ID.

Specified by:

getExpression in class IdGenerator

Parameters:

table - the main table of the entity

column - the name of the column of the ID

targetId - the current value of the ID

whereExpression - indicates if this expression is needed for a "SELECT ... WHERE ..." - some dialects behave differently in this situation

Returns:

the expression for selecting the ID

isPostIncrement

public boolean isPostIncrement()

Description copied from class: IdGenerator

Indicates that IdGenerator.createNextValue(Class) should be called after the entity was written - as the value is not available before.

Specified by:

isPostIncrement in class IdGenerator

Returns:

true if the database increments the value _after_ the insert statement was executed, true if it is incremented before or during the execution

setCurrentValue

public void setCurrentValue(long currentValue)

Description copied from class: IdGenerator

Sets a new start value.

Specified by:

setCurrentValue in class IdGenerator

Parameters:

currentValue - the current value - most likely as extracted from the target database

getDialect

@Generated(value="lombok")
public GeneratorDialect getDialect()

isRelativeIds

@Generated(value="lombok")
public boolean isRelativeIds()

getGeneratorTable

@Generated(value="lombok")
public GeneratorTable getGeneratorTable()

getPkColumn

@Generated(value="lombok")
public GeneratorColumn getPkColumn()

getPkColumnValue

@Generated(value="lombok")
public ColumnExpression getPkColumnValue()

getValueColumn

@Generated(value="lombok")
public GeneratorColumn getValueColumn()

getAllocationSize

@Generated(value="lombok")
public int getAllocationSize()

getInitialValue

@Generated(value="lombok")
public long getInitialValue()

getNextValue

@Generated(value="lombok")
public long getNextValue()

getMaxAllocatedValue

@Generated(value="lombok")
public long getMaxAllocatedValue()

The maximum allocated value. The value column value in the table is at any time by allocationSize greater.